Women's 400m Hurdles Semifinal 3
mercredi 17 août 2016, 00h24 GMT – 05h24 GMT
| Nom | Temps | |
|---|---|---|
| 1 |  Dalilah Muhammad | 53.89″ |
| 2 |  Sara Petersen | + 0.66″ |
| 3 |  Leah Nugent | + 1.09″ |
| 4 |  Sage Watson | + 1.55″ |
| 5 |  Grace Claxton | + 1.96″ |
| 6 | Janeil Bellille | + 2.17″ |
| 7 | Lauren Wells | + 2.94″ |
| 8 |  Viktoriya Tkachuk | + 2.98″ |